We provide spherical porous silica particles that do not disintegrate during production and exhibit high disintegration (easy disintegration properties) during use, for use as abrasives for precision polishing and scrubbing materials for cosmetics. To do. The average particle size is 0.5 to 50 μm, the pore volume is 0.5 to 5.0 cm3 / g, the mode of the pore size is 2 to 50 nm, the shape factor is 0.8 to 1.0, and the average compressive strength is A network-structured porous silica particle having a sodium content of 0.1 to less than 1.0 kgf / mm 2 and a sodium content of 10 ppm or less was realized. Further, the porous silica particles, a non-spherical silica particles are dispersed in water, a dispersion liquid preparation step of preparing a dispersion liquid of non-spherical particles, and a shearing force is applied to the dispersion liquid continuously or intermittently. However, it was produced by a method including a drying step of maintaining the viscosity of 8 to 100 mPa · s in a spray dryer and a firing step of firing the dried silica particles.精密な研磨を行う研磨剤や、化粧料のスクラブ材等に用いるために、製造中には崩壊せずに、使用中に高い崩壊性（易崩壊特性）を現す球状の多孔質シリカ粒子を提供する。 平均粒子径が０．５～５０μｍ、細孔容積が０．５～５．０ｃｍ３／ｇ、細孔径の最頻値が２～５０ｎｍ、形状係数が０．８～１．０、平均圧縮強度が０．１～１．０ｋｇｆ／ｍｍ２未満、及びナトリウム含有量が１０ｐｐｍ以下の網目構造の多孔質シリカ粒子を実現した。また、この多孔質シリカ粒子は、非球状のシリカ粒子を水に分散させて、非球状粒子の分散液を調製する分散液調製工程と、この分散液に連続的又は断続的にせん断力を加えながら８～１００ｍＰａ・ｓの粘度を維持して噴霧乾燥機に投入する乾燥工程と、乾燥したシリカ粒子を焼成する焼成工程を含む方法で作製した。
